A ramp is an inclined plane that is installed, even if stairs are already present. It lets the people who use wheel chairs, carts, cars and people who are pushing strollers to move easily inside a building. Ramps can either be portable or permanent, semi-permanent.  There is also one that is permanent and is designed in such a way that it is cemented in a single place. The one that is semi-permanent is kept on top of the cement pads or the grounds and is very often used only for a short period of time. But the one that is portable is made of aluminum and can also be folded, so that it can be carried easily from one place to another.